Showing papers on "Silicic acid published in 1987"

Adsorption of lutein from soybean oil on silicic acid I. Isotherms

Abstract: Adsorption of lutein from crude soybean oil miscella on dispersed silicic acid resulted in three different Freundlich type isotherms, depending on the amount of adsorbent used. Normally, changing the amount of adsorbent gives a new point on the same isotherm. Further investigation of the lutein adsorption revealed that addition of 1% isopropanol to the hexane solvent and deactivation of the silica acid with water decreased lutein adsorption. Purification of the lutein resulted in increased adsorption, indicating that triglyceride was competing for adsorption sites. The triglyceride competition was confirmed by calculating an adsorption isotherm for triglyceride from crude soybean oil miscella. Use of silicic acid as a column rather than dispersed yielded multiple isotherms for lutein adsorption based on the amount of adsorbent used. Also, lutein adsorption on columns was concentrated at the entrance to the column. Experiments showed that lutein adsorption was not due to partitioning between bound triglyceride and hexane solvent.

Consumption of silicic acid below the euphotic zone by sedimenting diatom blooms in the Barents Sea

Abstract: Massive sedimentation of spring phytoplankton blooms occurs in the Barents Sea as in many other shelf sea environments Associated with this sedimentation there is a large decrease in concentration of dissolved shcic acid below the nitracline This decrease is apparently related to resting spore formation of the dominant a broken arrows: Arctic water; hatched arrow: coastal water) Dotted h e : approximate posltion of the polar front 308 Mar Ecol Prog Ser 36: 307-312, 1987 rated a top layer of slightly warmed meltwater from the core of cold Arctic water below (Fig 2B) Nitrate and phosphate showed marked gradients between 45 and 60 m Silicic acid, on the other hand, was depleted down to 75 m, with a marked gradient below (Fig 2A) Ammonium exhibited a peak of 11 yM in the lower part of the nitracline at 60 m (Fig 2A) Chlorophyll in vivo fluorescence (Fig 2C) showed a maximum at the top of the nitracline (45 m) where POC and PON also had their maxima (Fig 2D) The highest chlorophyll a concentrations were found deeper (60 to 75 m), but this probably reflected an increase in chlorophyll due to photoadaptation (Bienfang et al 1983) rather than a maximum in phytoplankton biomass Particulate sihcon increased steadily with depth to 15 PM at 100 m (Fig 2D) The content of particulate silicon was low compared to the amount of dissolved silicic acid depleted between 45 and 75 m We therefore conclude that the majority of diatoms, which we suggest are responsible for this depletion, had already sedimented out from the investigated part of the water column Species-specific differences in sinking rate (Malone et al 1983) or seeding of resting stages (Smetacek 1985) are possible mechanisms behnd such a sink-out Massive reduction of the shcic acid content below the nitracline is not an isolated phenomenon, but has been observed regularly over extensive areas of the Barents Sea Fig 3 shows isopleth diagrams of shcic acid concentrations in summer along a north-south section in the central Barents Sea (Fig 1) Isolines for 1 and 8 yM nitrate are shown superimposed on these isopleths The June 1983 section extended 130 km into ice-covered waters where a pre-bloom plankton situation occurred SiLicic acid (about 4 yM) and nitrate (about 8 yM) o c c u ~ ~ e d here in the typical 1:2 molar ratio (ELlertsen et al 1982, Sakshaug & Holrn-Hansen 1984) South of ??ON, however, nutrients were virtually depleted from the surface layer and silicic acid concentrations at the depth of 8 FM NO3 were from 1 to 3 PM (Fig 3A) Simdarly, low silicic acid concentrations were found at the 8 yM nitrate depth in June 1984 both along the central section (Fig 3B) and a section along 45" E A plot of silicic acid vs nitrate concentrations for sampling depths of 50 m and deeper from this eastern section reveals that the majority of samples from all

Production of paper

Abstract: PURPOSE: To provide a method for producing the objective paper by which the yield of an ultrafine fiber and a filler, and the strength of the paper are improved by using an additive comprising a cationic monomer represented by a specific structural formula, and carrying out the papermaking CONSTITUTION: The papermaking is carried out by using an additive comprising (A) a cationic monomer of the formula (A is O or NH; n is 2-4; R1 is H or methyl; R2 to R6 are each a lower alkyl; X and Y are each an anion), (B) a cationic or amphoteric polymer having acrylamide and/or methacrylamide as a polymerizing component, and (C) a colloidal silicic acid Preferably, the component B has 100,000-3,000,000 average molecular weight, and the component C has 1-30 nm average particle diameter

High strength, fire-resistant gypsum composition

Abstract: A high-strength, fire-resistant composition containing calcium sulphate hemihydrate, a boron compound having fire-resistant properties including boric acid, anhydrous boric acid, sodium tetraborate decahydrate (borax) and sodium borate anhydrous, and aluminium and/or silicon compound including aluminium hydroxide, aluminium oxide and sodium aluminate and sodium silicate, silicon dioxide, silica gel and silicic acid, natural or synthetic fibres and water. Such compositions can be used in building materials such as wallboard, thermal insulation, fire breaks and soundproofing panels. More particularly the composition has greater strength and fire-­resistance when compared to standard gypsum wallboard and fire related gypsum wallboard. The application of this composition in slurry form and the use of this composition for use in finishing joints between wallboard are also contemplated.

Improved 63Ni radiochemical assay of free fatty acids in plasma

Abstract: We have modified the 63Ni radiochemical method of Ho (Anal Biochem 1970;36:105) for determination of free fatty acids (FFA) in plasma. Extracting 1 or 0.1 mL of plasma with Dole's mixture (J Biol Chem 1960;235:2595) and washing the "heptane" layer with two volumes of isopropanol/water/dilute (0.5 mol/L) H2SO4 (25/25/1, by vol) removes about 90% of the lipid phosphorus from the "heptane" layer without removing any FFA and is more convenient than treatment with silicic acid. The following modifications decrease background radioactivity and improve separation of the organic phase from the water phase containing the uncomplexed 63Ni: (a) use glassware instead of plastic test tubes; (b) evaporate the organic phase to dryness before adding the 63Ni (this removes the isopropanol, which interferes with the 63Ni assay); and (c) add anhydrous sodium sulfate before the final centrifugation step.

Preparation and constitution of the Crystalline Silicic Acid Trimethylsilyl Ester [(CH3)3Si]6Si6O15

Abstract: A new crystalline compound has been synthesized by trimethylsilylation of tetraethylammonium silicate which was identified by means of gas chromatography, mass spectrometry, 29Si NMR and X-ray analysis to be a eage-like double three-ring silicic acid trimethylsilyl ester containing six inequivalent SiO4 tetrahedra and trimethylsilyl groups. Herstellung und Konstitution des kristallinen Kieselsauretrimethylsilylesters [(CH3)3Si]6O15 Durch Trimethylsilylierung des Tetraethylammoniumsilicats wurde ein neuer kristalliner Kieselsauretrimethylsilylester hergestellt. Konstitutionsuntersuchungen mit Hilfe der Gaschromatographie, Massenspektrometrie, 29Si NMR- und Rontgenanalyse zeigen, das der Kieselsauretrimethylsilylester aus kafigartigen Doppeldreiringen aufgebaut ist, die jeweils sechs nichtaquivalente SiO4 Tetraeder und Trimethylsilylgruppen enthalten.

Interrelationship between hemolysis and lipid peroxidation of human erythrocytes induced by silicic acid and silicate dusts.

Abstract: Silicic acid and silicate dusts (slate dust and chrysotile asbestos) cause hemolysis of erythrocytes in vitro. The peroxidation of polyunsaturated fatty acids (PUFA) of erythrocyte membrane lipids is also enhanced by incubating the erythrocytes with silicic acid and silicate dusts in in vitro. Hemolysis of erythrocytes elicited by silicic acid and silicate dusts is inhibited significantly by polyvinyl-pyrrolidone and dipalmitoyl lecithin (DPL). These agents, however, have no effect on silicic acid and silicate dust induced peroxidation of erythrocyte membrane lipids. On the other hand, peroxidation of erythrocyte membrane lipids, induced by silicic acid and silicate dusts, is inhibited almost completely by adding superoxide dismutase and catalase to the incubation system, whilst the hemolysis of erythrocytes induced by silicic acid and silicate dusts is unaffected by these agents. Similarly the lysis of erythrocytes, induced by silicic acid and silicate dusts, proceeds at a much faster rate than silicic acid and silicate dust induced lipid peroxidation. These results indicate that silicic acid and silicate dust induced hemolysis and lipid peroxidation represent two independent processes.

Phosphate inhibition of protein-polysilicic acid complex formation in vitro: a factor in preventing silica urolithiasis.

Abstract: Phosphate concentration and pH were studied as factors influencing the formation of insoluble protein-polysilicic acid complexes of bovine serum albumin (BSA) or urinary proteins (nondialyzable urinary solids, NDUS) with silicic acid under conditions of constant ionic strength (IS) equivalent to 0.1724 N. In the pH range 5.5-7.0, the amount of protein-silicic acid complex measured turbidimetrically increased with decreasing pH. Only a trace of precipitate occurred with use of either of the protein sources at pH 7 or with NDUS at pH 6.5. With BSA at pH 6.5, phosphate supplying the total IS of the solution completely prevented precipitation of the complex. The phosphate effect was linear when it supplied 20-50% of the IS. In this range, there was a 12.3% reduction in the amount of precipitate for each 10% of the IS supplied by phosphate. With NDUS at pH 6.0, the phosphate effect was linear over its full range of concentrations. The phosphate effect resulted in an 8.7% reduction in the amount of precipitate for each 10% of the IS supplied by phosphate. On removal of the precipitated protein-silicic acid complex from the silicic acid solution, dissolution was facilitated by increases in phosphate concentration and pH. It is concluded that phosphate inhibition of protein-polysilicic acid complex formation may play a role in the reduction of silica urolithiasis related to increases in dietary phosphate.

Silica or silicic acid particles whose surface located hydroxyl groups are at least partially replaced by organic groups

Abstract: Silicic acid or silica particles having initially surface-located hydroxyl groups are modified by replacing at least partially the hydroxyl groups by an organic group to impart the particles with emulsion-breaking and foam-destroying properties. Processes for preparing the modified particles are also disclosed.

Preparation of silica sol

Abstract: A method for producing a silica sol containing less than 200 ppm sodium having an average particle size of 2-110 nm, and a particle size distribution with a coefficient dispersion of 0.16-0.4. The silica sols are produced using a lower alkanolamine containing heal to which aliquots of silicic acid are added. The aliquots are added to maintain a substantially constant concentration of colloidal silica in the product. Subsequent to production, the sol may be concentrated by ultrafiltration. Preparation of low sodium silica sol utilizing a constant silica technique by heating the initial heel to 94°±4° C. and adding additional silica maintaining constant total silica. The stabilization is effected with an alkanolamine.

Hochauflösende Festkörper-NMR-Untersuchungen an Kieselsäuren. III Hochauflösende 29 Si-Festkörper-NMR-Untersuchungen an synthetischen siliciumreichen Kieselsäurehydraten

Abstract: Hochauflosende 29Si-Festkorper-NMR-Experimente wurden zur Untersuchung des Aufbaus der Silicatschichten in drei siliciumreichen Kieselsaurehydraten eingesetzt, die durch Kationenaustauschreaktionen aus den synthetischen Natriumsilicathydraten Ilerit, Magadiit und Kenyait hergestellt wurden. Fur jede der untersuchten Verbindungen wurden zwei deutlich getrennte Signale nachgewiesen, die den Q3 - (OSi(OSi)3–) und den Q4- (Si(OSi)4–) Baugruppen der Silicatschichten der entsprechenden Kieselsaurehydrate zugeordnet werden konnen. Auf Grund dieses Befundes wird zur Beschreibung der Struktur der Silicatschichten in den untersuchten Verbindungen das gleiche Modell herangezogen, das bereits fur die Interpretation der NMR-Ergebnisse an den Natriumsilicathydraten benutzt wurde. Im Vergleich zu den Natriumsilicathydraten wird in den Kieselsaurehydraten ein etwas groseres Q4/Q3- Verhaltnis und ein zu hoherem Feld verschobenes Q3-Signal gefunden. Diese Befunde werden auf strukturelle Veranderungen zuruckgefuhrt, die im Ergebnis des Kationenaustausches auftreten. Solid-State High-Resolution N.M.R. Studies of Silicic Acids. III. Solid-State High-Resolution 29Si-N.M.R. Studies of Synthetic Highly Siliceous Silicic Acid Hydrates Solid-state high-resolution 29Si-N.M.R. experiments were used to study the structure of the silicate layers in three synthetic highly siliceous silicic acid hydrates obtained by cation exchange reactions from the synthetic sodium silicate hydrates ilerite, magadiite and kenyaite. For each of the studied samples two well-separated N.M.R. signals have been recorded which could be assigned to Q3 - (OSi(OSi)3–) and Q4-(Si(OSi)4–) units of the silicate layers of the corresponding silicic acid hydrate. On the basis of these results the same model was used to describe the structure of the silicate layers in the studied compounds which has been already used for the interpretation of the N.M.R. results in case of the synthetic sodium silicate hydrates. Compared with the sodium silicate hydrates in the studied silicic acid hydrates a somewhat large Q4/Q3-ratio and a high-field shifted Q3signal have been detected. These observations were attributed to structural changes which appeared as a result of the cation exchange reactions.

Microporous film and production thereof

Abstract: PURPOSE: To obtain a polypropylene film having uniform micropores, by melt- molding a mixture obtd. by adding a silicic acid filler and specified additives to a polypropylene resin into a sheet or film and orienting it. CONSTITUTION: This microporous film is composed of a polypropylene resin having an intrinsic viscosity of 1.9W3.0dl/g (in tetralin at 135°C), such as a propylene homopolymer, a copolymer of propylene with other copolymerizable monomer or a mixture thereof, has a network structure composed of communicating pores having the max. pore size of 1μ or below and an average pore size of 0.005W0.6μ, a void content of 30W90%, a gas trasmission rate of 5W500 sec/100cc and a thickness of 5W200μ and is oriented. This microporous film can be obtd. by molding a mixture of 20W80wt% polypropylene resin (a), 80W20wt% silicic acid filler (b) having an average particle size of 1μ or below, a plasticizer (c) such as a polyester or epoxy plasticizer, and a silane dispersant (d) into a film and drawing it 1.5W30-folds. COPYRIGHT: (C)1988,JPO&Japio

Method of producing a bioactive glass or glass ceramic precurser gel

Abstract: A method of producing a multicomponent gel as a precursor of a bio-active glass of glass-ceramics useful for artificial tooth roots or artificial bones, which comprises the step of reacting (A) at least one or the types of silicic acid ester such as tetramethoxysilane or tetraethoxysilane; (B) at least one of the types of phosphorous compound represented by general formulas [II], [III] or [IV]: (where each of R₅ to R₉ is hydrogen, an alkyl group, with 1 to 5 carbon atoms, a phenyl radical, or an aralkyl group with 7 to 10 carbon atoms in which at least one of R₁₀ to R₁₂ is hydrogen, and m: 0 to 10); and (C) an alkaline earth metal salt or an alkoxide thereof in the presence of water at pH of not higher than 8.

Production of high-purity silica sol of large particle size

Abstract: PURPOSE: To enable low-cost production of high-purity silica sol of large particle sizes, by preparing an aqueous colloidal solution of active silicic acid of high purity from an aqueous alkali metal silicate, allowing the solution to react with an alkali metal hydroxide solution to form a stabilized aqueous silica colloidal solution of high purity and using the product as a starting material. CONSTITUTION: An aqueous colloidal solution of activated silicic acid is prepared by removing alkali metal ions from an aqueous metal silicate solution of 2W6% SiO 2 content. The product is used as a starting material to effect treatment with an ion-exchange resin to give an aqueous colloidal solution of activated silicic acid of high purity. The high-purity colloid is combined with an aqueous alkali metal hydroxide of high purity to form a stabilized aqueous colloidal solution of silica of high purity, then an aqueous solution of alkali hydroxide of high purity is added thereto. Further, the stabilized aqueous colloidal solution of silica of high purity is added thereto, thoroughly stirred at 90W150°C and aged after an acid added in an amount of 40W90% based on the equivalent of the alkali. The resultant silica sol is concentrated to give silica sol of large particle sizes and reduced contents of Al and Fe. COPYRIGHT: (C)1988,JPO&Japio

New diagnostic techniques for the detection of organic acidemias.

Abstract: We describe an improved procedure for the extraction of organic acids which is equally suitable for urine, plasma and amniotic fluid and gives similar high recoveries for a wide variety of organic acids, without interferences from phosphate, sulfate, or urea. Internal standards are added, the oxoacids are converted to the pentafluorobenzyloximes; the sample is concentrated, acidified, chromatographed on a small column of silicic acid, and the effluent neutralized and dried. After forming the trimethylsilyl derivatives, gas chromatography is done on a 0.53 mm X 30 m low-polarity bonded-phase fused silica capillary column. For gas chromatographic-mass spectrometric quantification, the peak areas at the m/z of a characteristic fragment ion for each acid relative to the peak areas of ions of the internal standards are related to standard curves.

Aluminum hydroxide filled casting resins on a basis of methacrylic acid esters, and plastic objects and moldings manufactured therefrom

Abstract: Disclosed is a casting resin of reduced viscosity based on methacrylic acid esters with a high content of aluminum hydroxide as filler containing a mixture of at least one organosilicon compound with a functional group, at least one silicic acid ester, and at least one organic metallic acid compound of metals of Groups IVB and/or VB of the Periodic Table of the Elements. The functional group of the organosilicon compound is ethylenically unsaturated and bound to the silicon atom either directly or by alkylene groups. The casting resins of the invention have improved working qualities. Plastic objects and moldings manufactured from these resins have decidedly improved use properties.

Preparation of polysiloxanes from silicic acid. IX: Partially silylated silicic acid and its spinnability

Abstract: The reaction in different molar ratios of trimethylchlorosilane to silicic acid offered partially silylated silicic acids PSSX (X = OH) with various degrees of silylation. Esterification and acetylation of PSSX (X = OH) with 1-butanol or acetylchloride gave polysiloxanes PSSX (X = OBun and OCOCH3). Some of them showed an excellent spinnability and provided a fine fiber with a length of about 250 cm. A fiber drawing test from concentrated PSSX solutions of various solvents revealed that spinnability markedly depended on the DS, functional group X of PSSX, and solvent. Spinnability may also be correlated to solubility parameter of PSSX and solvent.

Production of modified titania sol

Abstract: PURPOSE: To obtain a modified titania sol having excellent dispersibility, long- term stability, light resistance, etc., by adding H 2 O 2 to a gel or sol of hydrated titanic acid, heating the resultant solution in the presence of an inorganic compound and reacting the produced titania sol precursor with an Si compound or a Zr compound. CONSTITUTION: H 2 O 2 is added to a sol and/or gel of hydrated titanic acid to effect the dissolution of the hydrated titanic acid and obtain a uniform aqueous solution having a TiO 2 concentration of preferably about ≤5wt.%. The hydrated titanic acid can be completely dissolved by adding the H 2 O 2 at an H 2 O 2 /TiO 2 ratio of ≥1. The obtained aqueous solution of titanic acid is heated at ≥60°C, especially at ≥80°C in the presence of an inorganic compound to hydrolyze the titanic acid. The obtained titania sol precursor is reacted with an Si compound (e.g. silicic acid solution) or a Zr compound (e.g. ZrCl 2 ). The modified titania sol produced by this process has the above characteristics and is stable over a wide pH range. COPYRIGHT: (C)1988,JPO&Japio

Process for the production of a free flowing, powdered elastomer filled with silicic acid

Abstract: A process produces a free flowing, silicic-acid-filled, powdered elastomer wherein the silicic acid employed has the properties set out below: (a) SiO 2 content: about 82-91.5% by weight; (b) metallic oxides: about 0.5-3% by weight; (c) loss on ignition (DIN 55 921/2--measured at 100° C.): about 8-15% by weight; (d) moisture (DIN 53 198--measured at 105° C.): about 2-10% by weight; (e) surface area of the primary particles according to BET: about 40-250 m 2 /g; (f) dibutyl phthalate absorption (ASTM D 2414-79) based on measured weight: about 170-290%. (g) linear average of numerical distribution of secondary particles: about 10-2,000 nm; (h) linear average of volume distribution of secondary particles: about 3-30 um; (i) proportion of secondary particles with a diameter of less than 1 um: about 0.01-5% by weight wherein the percentages of parameters (a) to (c), added up together, must yield 100% by weight.

Production of high-purity spherical silica

Abstract: PURPOSE: To obtain a spherical silica having high purity, by adding a specific organic solvent and a nonionic surfactant to a mixed solution of a silicic acid ester, water and a catalyst and producing a silica gel while forming a W/O-type emulsion. CONSTITUTION: A mixed solution composed of 1mol. of a silicic acid ester (e.g. tetramethoxysilane) and 1W20mol. of water is added with (A) 0.5W10pts.vol. (based on 1pt.vol. of the silicic acid ester) of an organic solvent (e.g. n-heptane) incompatible with water, (B) 0.001W0.4pt.vol. of a nonionic surfactant having an HLB of ≤12 (e.g. polyoxyethylene alkyl ether) and (C) an acid or alkali catalyst to form a W/O-type emulsion. The components are made to react with each other at 0W100°C to form a silica gel. The formed silica gel is separated, dried at 50W450°C for 1W30hr and calcined at 500W1,800°C for 1W30hr. COPYRIGHT: (C)1988,JPO&Japio

Arylsiloxane/silicate compositions useful as interlayer dielectric films

Abstract: Oligomers and polymers, useful as interlayer dielectric films, are formed by the co(hydrolysis/condensation) of an aryl group-containing trifunctional silanetriol or derivative with a tetrafunctional silicic acid compound. The respective tri- and tetrafunctional substituents on either silicon compound reaction are chosen so that they act as reactants in condensation oligomerization or polymerization reactions with the substituents on the other reactant.

Foamable bathing agent

Abstract: PURPOSE:To obtain a foamable bathing agent having excellent storability and remarkably improved stabilizing effect compared with an agent containing magnesium oxide as a stabilizer, by adding a silicic acid as a stabilizer to a foamable bathing agent composition obtained by mixing a carbonate with an organic acid. CONSTITUTION:A foamable bathing agent is produced by mixing a carbonate (e.g. sodium bicarbonate, magnesium carbonate, etc.) and an organic acid (e.g. succinic acid, citric acid, etc.) and mixing the obtained foamable bathing composition with preferably 0.5-10wt% silicic acid as a stabilizer. The silicic acid is especially a light silicic anhydride produced in vapor phase and its amount is preferably 2-4wt%. Silicic anhydride has strong water-absorptivity and contains water which cannot be removed by ordinary drying conditions. It is considered that the higher stabilizing effect of the silicic anhydride as against that of the magnesium oxide is caused by the property of silicic anhydride to contain about 4 times the amount of water in weight.

Heat-resistant coating compound composition

Abstract: PURPOSE: To obtain the title composition providing a coating film having excellent corrosion resistance and rust prevention through application to the surface of metal, containing potassium silicate, colloidal silica, hydrous aluminum silicate, aluminum polyphosphate, strontium sulfate and chromium oxide in a specific ratio. CONSTITUTION: The aimed composition consisting of (A) 42W65wt.% potassium silicate [K 2 O.nSiO 2 .xH 2 O (n is 2W3.8)], (B) 8W14wt.% colloidal silica (ultrafine powder of silicic acid anhydride), (C) 1W2wt.% hydrous aluminum silicate, (D) 5.0W12.0wt.% aluminum polyphosphate (preferably aluminum tripolyphosphate or aluminum metaphosphate), (E) 2W8wt.% strontium sulfate and (F) 0. 5W7wt.% chromium oxide. COPYRIGHT: (C)1989,JPO&Japio

Production of alkylated aromatic compound

Abstract: PURPOSE:To obtain the titled compound in high selectivity, conversion and purity, by reacting an aromatic hydrocarbon with an alkylation agent in the presence of a catalyst comprising a hydrogen-type zeolite Y having an Na2O/Al2 O3 molar ratio and a crystallinity falling within respective specific ranges. CONSTITUTION:The objective compound is produced by reacting an aromatic hydrocarbon with an alkylation agent in the presence of a catalyst comprising a hydrogen-type zeolite Y having an Na2O/Al2O3 molar ratio of 0.20-0.35, especially 0.20-0.30 and a crystallinity of 40-60% determined by X-ray diffraction. The zeolite catalyst can be synthesized by treating a clay mineral (e.g. montmorillonite, kaolin, etc.) with an acid under a condition to eliminate the X-ray diffraction peak assignable to the plane index [001] and using the active silicic acid or active aluminosilicic acid produced by the above treatment as a silica raw material. When the reaction is carried out in a liquid phase or in batch, the conversion can be further improved by passing an inert gas through the reactor. The condensation reaction of the aromatic hydrocarbon with each other can be suppressed to obtain a high-purity objective compound and the separation and purification procedures can be facilitated.

Production of planographic plate material

Abstract: PURPOSE: To produce the title material extremely easily at low cost with a reduction in the number of production processes, by providing a boehmite film on a plate-making surface of an aluminum-made base for a plate material, and treating the surface of the film with a solution containing a hydrophilic inorganic compound to provide a hydrophilic inorganic film. CONSTITUTION: A boehmite process is carried out by using, for example, water or a solution prepared by adding a small amount of silicate, tannic acid or a tannate to water, whereby an extremely porous boehmite film 2 is provided on an aluminum-made plate-making surface of a base 1 for making a plate. Then, the surface of the boehmite film 2 is treated with a solution containing a hydrophilic inorganic compound selected from the group consisting of silicic acid, silicate, silica sol and alumina sol. The base thus treated is dried by heating at a temperature of not less than 50°C, preferably, 150W180°C for 30 secW30min to provide a hydrophilic inorganic film 3 on the surface of the base. COPYRIGHT: (C)1988,JPO&Japio

Process for the production of free-flowing rubber powders with silicic acid as filler

Abstract: A process for the production of free-flowing rubber powders with silicic acid as filler comprises combining a rubber latex with silicic acid filler while stirring in the presence of specific auxiliary agents, adjusting the pH range of the mixture to cause coagulation, and separating and drying the resultant solids wherein the specific auxiliary agents comprise organic surfactants together with colloidal silicic acid.